26 lines
687 B
LLVM
26 lines
687 B
LLVM
|
; RUN: opt -S -instcombine %s -o - | FileCheck %s
|
||
|
|
|
||
|
|
; Regression test of PR31990. A memcpy of one byte, copying 0xff, was
|
||
|
|
; replaced with a single store of an i4 0xf.
|
||
|
|
|
||
|
|
@g = constant i8 -1
|
||
|
|
|
||
|
|
define void @foo() {
|
||
|
|
entry:
|
||
|
|
%0 = alloca i8
|
||
|
|
%1 = bitcast i8* %0 to i4*
|
||
|
|
call void @bar(i4* %1)
|
||
|
|
%2 = bitcast i4* %1 to i8*
|
||
|
|
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %2, i8* @g, i32 1, i1 false)
|
||
|
|
call void @gaz(i8* %2)
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture writeonly, i8* nocapture readonly, i32, i1)
|
||
|
|
declare void @bar(i4*)
|
||
|
|
declare void @gaz(i8*)
|
||
|
|
|
||
|
|
; The mempcy should be simplified to a single store of an i8, not i4
|
||
|
|
; CHECK: store i8 -1
|
||
|
|
; CHECK-NOT: store i4 -1
|